An interval timer for arc duration

IN DEVELOPMENT work leading to new and improved designs of equipment involving arc interruption the success of the work is to a large extent influenced by the quality of the instruments used for measurement. The arc-interruption problem is one that has been in existence since the first electric installation. Nevertheless, progress continually is being made in developing smaller and more efficient devices for stopping the flow of electric current. One of the most promising ways of furthering this progress lies in the development of new methods of measurement.